Scratch-Resistant Improvement of Sol-Gel Derived Nano-Porous Silica Films |
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| Authors: | Jue Wang Guangming Wu Jun Shen Tianhe Yang Qinyuan Zhang Bin Zhou Zhongsheng Deng Bin Fan Dongping Zhou Fengshan Zhang |
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| Institution: | (1) Pohl Institute of Solid State Physics, Tongji University, Shanghai, 200092, P.R. China;(2) Shanghai Institute of Technical Physics, Chinese Academy of Science, Shanghai, 200083, P.R. China |
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| Abstract: | Scratch-resistance of sol-gel derived nano porous silica films were studied. The thin films were prepared with a dip-coating method from both one-step and two-step catalyzed silica sols, and treated in a mixture gas of ammonia and water vapour afterwards. The thin films were characterized by using Atomic Force Microscope (AFM), ellipsometer, Fourier-transform Infrared Spectroscope (FTIR), respectively. Experimental results have shown that the two-step catalysis remarkably improves strength of the films, and abrasion-resistance and adhesion of the silica films were further increased after the mixture gas treatment. It is attributed to the cross-linking of silica particles in the sols by randomly branched or/and entangled linear chains and more Si–O–Si bonds formed by the mixture gas treatment. |
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| Keywords: | sol-gel process silica film AFM refractive index |
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